Map - Friesland (Provincie Friesland)

Friesland (, ; official ), historically and traditionally known as Frisia, named after the Frisians, is a province of the Netherlands located in the country's northern part. It is situated west of Groningen, northwest of Drenthe and Overijssel, north of Flevoland, northeast of North Holland, and south of the Wadden Sea. As of January 2020, the province had a population of 649,944 and a total area of 5,749 km2.

The province is divided into 18 municipalities. The capital and seat of the provincial government is the city of Leeuwarden (West Frisian: Ljouwert, Liwwaddes: Liwwadde), a city with 123,107 inhabitants. Other large municipalities in Friesland are Sneek (pop. 33,512), Heerenveen (pop. 50,257), and Smallingerland (includes city of Drachten, pop. 55,938). Since 2017, Arno Brok is the King's Commissioner in the province. A coalition of the Christian Democratic Appeal, the People's Party for Freedom and Democracy, the Labour Party, and the Frisian National Party forms the executive branch. The area of the province was once part of the ancient, larger region of Frisia. The land is mostly made up of grassland and it has numerous lakes. The official languages of Friesland are West Frisian and Dutch. It was named after the region of Frisia.

In 1996, the Provincial Council of Friesland resolved that the official name of the province should follow the West Frisian spelling rather than the Dutch spelling, resulting in "Friesland" being replaced by "Fryslân". In 2004, the Dutch government confirmed this resolution, putting in place a three-year scheme to oversee the name change and associated cultural programme.

The province of Friesland is occasionally referred to as "Frisia" by, amongst others, Hanno Brand, head of the history and literature department at the Fryske Akademy since 2009. However, the English-language webpage of the Friesland Provincial Council refers to the province as "Fryslân".